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Business, Basis of Presentation and Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 1,423	$ 1,426
Other assets	902	1,027
Contract cost assets	111	108
Amortization expense	25	24
Deferred income taxes	1,458	1,610
Operating expenses	2,746	2,606	$ 2,562
Net cash (used in) provided by operating activities	$ 1,310	$ 1,868	1,582
Retirement
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax, percentage	27.40%	28.40%
Corporate
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax, percentage	3.60%	17.30%
Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Receivables	$ 249	$ 237
Adjustment for adoption of ASU			$ 84
Difference between Revenue Guidance in Effect before and after Topic 606 \| Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Other assets		108		$ 106
Deferred income taxes		23		(22)
Adjustment for adoption of ASU		85		$ 84
Operating expenses		2
Net cash (used in) provided by operating activities		0
Minimum
Disaggregation of Revenue [Line Items]
Weighted Average Amortization Lives	5 years
Maximum
Disaggregation of Revenue [Line Items]
Weighted Average Amortization Lives	15 years
Distribution Fees
Disaggregation of Revenue [Line Items]
Revenue	$ 438	$ 469